Saturday 5 April 2014

Grind Customs FX DeProfundis Delay

Rej at Grind Customs FX is well known in the DIY community.  He designs some great effects, shares a lot of projects with us all and also sells some really excellent PCBs, the Chimaera in particular is extremely popular with those who want to build a Klon in a small box.  See the projects on his forum at http://www.grindcustomsfx.com/forum and check out his PCBs at http://www.grindcustomsfx.com.

This one in a very nice sounding delay based on the PT2399 IC and is definitely a recommended build.
Info from Rej about his effect:

Overview
The DeProfundis Delay is a PT2399 based digital delay with aggressively filtered repeats and the possibility of very long delay times (and minimal delay line noise). There is also a tone control trimmer to adjust the high pass cutoff frequency on the repeats. The stock values yield a max delay time of approximately 550ms - 600ms. With a minor modifications (see below), max delay time can be extended to almost 900ms.  

Tweaks & Modifications  

“Love You Long Time” - Extend the max delay time

This is a very easy modification. Change the Time pot to A100K and then add a 270K resistor in parallel with Time. You can add the resistor either to the pot pads on the board, or you can use the pads marked “M1” and “M2” (see below for more info on these). Adding the 270K resistor brings the Time pot’s total resistance value down to about 75K, which is about the limit of what this circuit can handle without getting noisy and producing synth like repeats (more resistance = more delay time). If you don’t have 270K on hand, try 220K, but be aware that this will give you less max delay time. Or you could put multiple resistors in series to get close to 270K.  

Even Darker Repeats 
If the dark and murky tone of the stock circuit does not satisfy your black heart, try increasing the value of C7 (Mark's note: 10n cap to ground under IC2) to taste.




Video of Rej's build with modulation added.  And before you ask, yes I am :o)







This version is based on Rej's notes for increasing the maximum delay time.  Instead of putting a resistor in parallel with the Time pot I've used a multi-turn trimmer so you can set the maximum delay time exactly, to the point just before things starts getting a bit noisy. 




Here is the modulation daughterboard for those wanting to add it to the effect.  It is based on Rej's Portable LFO schematic and although it is designed for the DeProfundis, it would work equally well to add delay to other PT2399 based delay pedals such as the Deep Blue Delay.

The main modulation switch will be centre off, in one position you'll have modulated delay, in the other position you'll have modulation only.

The Shape switch will let you select a sin or square wave, and could if you prefer be swapped for a 500K linear pot which will sweep between the two waves and then give you the in between settings too.

The LED and LDR need to face each other, ideally tape them together or use heat shrink around them so you can try the circuit without it needing to be boxed first.  You'll need to experiment with LED type and colour etc and LDR type to see how it works for you, or maybe use a Vactrol for an integrated unit.



161 comments:

  1. Small correction made, get the latest version now! :o)

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  2. The man in the video has a switch. You didn't include it? He modded his? What happened?

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    1. Oh, it says he modded it. Embarassing!

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    2. That will be the modulation switch and I'll add a daughterboard for that soon

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    3. In the demo i'm using the modulation board that IvIark have now posted with the 2 possible modes.

      There's probably better clips of this layout on youtube, hopefully!

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  3. Modulation board added to post.

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    1. The LDR that Tayda sells works perfectly for this application with a 3mm orange diffused LED.

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    2. Thanks for the info Rej, and the project of course :o)

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  4. In the first layout switch feedback 1 and 3, bring the Time2/3 wire down one row, and turn those two 10n caps on the left into 100n and then it will work and match the schematic.

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    1. God I made a right pigs ear of that! :o)
      Thanks for the heads up buddy, layouts corrected.
      Have you built it or just gone over it?

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    2. Built it and it sounds good!

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    3. Excellent, thanks for verifying

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    4. Thanks for verifying Sir! :)

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  5. Is there a discrepancy with the cut and link in the top left corner of the daughter board? They look like they switch sides.

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    1. Yes, I've corrected it now. I do that sometimes when I rejig the main board a bit after I've copied the bare board and forget to change that one too :o)

      If you've already done the cuts it will still work fine though. The 10n cap can be shifted to any of the free spaces horizontally, so just put that above the 10u or 47u cap.

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  6. A quick question. I see that the daughter board should work on the Deep Blue. Is that known to be for sure? Also will the mod for extended delay time work there as well?
    Keep up the great work!

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    1. Yes it will definitely work with a DBD too, as will the extended delay time

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  7. I built the daughter board and the led is on all the time. The depth pot dims and brightens it but there is no blinking. I double checked tracks for shorts and cold joints and I couldn't come up with anything obvious. I've looked over the layout many times and it seems I have it correct.

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  8. I have experienced exactly the same symtoms on my board as Luke has.

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  9. I'm getting 4.6V at pins 1,2,3,5,6,7 and 9.6 at 8 .001 at pin 4. None of the voltages are varying. 5-7 start a bit lower than 4.6 and creep up to rest at 4.6

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    1. I think I have figured it, its the 47uf cap. It has its positive connection on row 5/pin 3 of ic whereas it should be on the 9v line. I disconnected it and the light flashes. I then did a bodged connection from the cap + to the 9v line as I suppose the cap is needed to keep the osc. stable and of course it still works or at least it still flashes. I have yet to do the LDR and the connection to the motherboard yet!

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    2. I think you are correct based upon a second look at the schematic which shows the 47u going from power to ground as a power supply filter I believe.

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    3. No. There are 4 filter caps, a 100u from 9V to ground under IC2 is the main filter cap, a 100u from the 5V output of the regulator to ground, a 47u from VR to ground (pin 5 cap) and a 47u from VR of the PT2399 (pin 2) to ground. The cap at pin 5 is definitely correct.

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    4. We are talking about the daughterboard. I have the main board up and running no problem!

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    5. Sorry, my first post in this thread was meant as a reply to my previous post, as is it is a bit ambiguous.

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    6. Sorry you were talking about the daughterboard weren't you. :o)
      I'd remove that cap completely. The reason why I included it is because in my head I was thinking of it being a reference voltage, but with it being an oscillator it must affect its operation. I omitted the 47u filter cap between supply and ground because you don't need it, the 9V supply into the pedal is being filtered on the main delay board and the supplies are directly connected, and so adding another filter cap will just be like having a 147uf filter cap between supply and ground.

      So yes I'd just snip it out and I'll edit the layout.

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    7. No worries! I love all the delay layouts you've been doing lately I think the dual cave dweller may be my next build!

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    8. Just to confirm the daughterboard works with the motherboard OK. In fact I ordered rej's board and it works fine with that. The only thing I am not sure about is the third position on the modulation switch. In the centre the LDR is not connected to both sides of the Rate control and so I just get delay. In one position it is and the full Zombification takes effect! But in the other position the Sw2 end of the LDR is earthed and so that means that I have two no-modulation modes and one modulation mode. I don't see how the "Modulation only mode" referred to in Marks description works. I thought perhaps it was a vibrato mode. Have I c**ked it up or just missed the point?

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    9. I made the correction to the layout mentioned on the post on the Portable LFO topic in Rej's forum, and so swapped the M1 and M2 connections. Did you use the first version of the daughterboard layout I posted? If so, swap the [TIme 1] and [Time 2 & 3] wires over.

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    10. Thanks yes I did use the original layout but I wired it as per the later version. I looked at the thread on Rej's forum to confirm that I had it right. I nonetheless swapped time 1 and time 2/3 over to check and I now get mod-echo/echo/mod-echo. So far as I can see all that switch does is connect the LDR across the Rate pot or not!
      Anyway its a great effect as it is. FWIW I used a 3mil diffuse green led with anLDR both from Doctor Tweek. I pointed the LED at the LDR and wrapped them with shrink wrap as you suggested. Worked without any need for fiddling. Thanks.

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    11. Hi, shouldn't one pole of the mod switch be across the mix pot to give 100% wet signal for vibrato etc.?
      One position shorts the LDR to ground, and the other two apply modulation to the Time pot as far as I can see at the moment.....
      Thanks......

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    12. The center off disconnects the modulation. The side that connects the ldr to ground gives modulation only (No echo decay, the note stops when you stop playing). The other side modulates the echo, repeats decay normally. That's the best I can describe the way that mine works.

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  10. Thanks Luke - so the ldr to ground sounds like a chorus pedal?

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  11. Or does it sound like vibrato? I'm building the enclosure and doing the graphics at the same time as making the boards, and I'm wondering what to put on it.

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  12. It definitely has some chorus type sounds depending on the settings, it can get pretty crazy too. I'm not that familiar with Vibrato but this pedal will do quite a lot.

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    1. Vibrato is just a chorus without the dry signal, so you get all wobble with no dry signal mixed in.

      I just followed the scheme and noted correction with this one, but I'll check it out tomorrow to see what's amiss and get the layout corrected so it does everything intended.

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    2. If you wanted to cut out the dry signal I believe you could make a cut in the track on the top row between the jumper from IC1 and the 22k and add a and spst switch Or you could add a cap and a pot to have a volume control. I did the volume control and didn't find it too useful but I didn't try it with modulation which could be pretty cool. I discussed it at the stompbox forum in this thread: http://www.diystompboxes.com/smfforum/index.php?topic=106941.msg969306#msg969306

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    3. Correction: I meant IC2.

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    4. I might not be quite right. I can't remember exactly what I did. I was trying to make the mix pot a fade between dry and wet level and all I ended up doing was cutting out the dry signal. At any rate, It can be done.

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  13. Build this one today and found a slight volume drop to the bypass signal. The original schematic has a 1K before the volume pot (R6), this one here says 10K.... Mark:)?

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    1. Copy/paste syndrome. Now corrected, cheers for the heads up

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    2. Thanks again Mark, I meant output wire (not "volume pot") btw...:). Although adding a volume control might be usefull for some applications....

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  14. Any news on the modulation switch layout for this Mark?
    Heiko - what does your mod switch do on each setting?

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    1. modulated delay - delay only - modulation only (pos. 1 - 2 - 3)

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    2. Thanks for that, Heiko.... Now I can get on with building the enclosure.

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  15. This does not work with red LED: ( ..,,but the delay sound good,,, tone pot works well thanks ivark
      greetings 2 for agung
    mahendra

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    1. The Modulation doesn't work with a red LED? I used an ultrabright white LED with tayda's ldr and that seems to be working really well. Coincidentally I wrapped it with red electrical tape and haven't subjected it to complete darkness yet so I don't know if the red is effecting how it responds but it sounds nice.

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    2. who knows, maybe the fault is in me, I will try later thanks to white LED information mr.LUKE cheers

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  16. and thanks IvIark, good sound delay works well, the tone pot is helpful to clarify the sound clean sound delay ..
    I just use a simple recording equipment, oops I did not use the layout modulation


    http://www.youtube.com/watch?v=V_s4P5klPOQ

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    1. That's great, thanks for posting!

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    2. okay thank iviark, delay is what I've been looking for .. cheers I like vero broad

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  17. Yes, this delay is really great, I think it beats my DBD. I´ll try adding a tone control to it, that should be a really useful feature....

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  18. damn man .. I find it very useful tone pot. I replaced the pot for a long time with A100k delay: D

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  19. I just added the mod board to my Deep Blue but when I am in the mod with delay mode it speeds up my delay time a lot. I bridged the time delay time pot for longer delay times and am wondering if the the combination of this and the mod board is creating this adverse reaction. Mod only works fine and delay only works fine. I will try to trouble shoot tomorrow.
    Btw I used a ultrabright red and seem to be getting a good response aside from the above mentioned prob. Any thoughts would be appreciated.

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    1. It happens something similar to me on my deep blue delay, but, i only get on the on-off-on switch two positions with delay and one with modulation and a little bit of delay. If you can solve the problem please post here the solution for it, i'll really appeciate it! Thanks!

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    2. I'm still trying but always end up back at the same point.

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    3. I built the deprofundis and tried the mod board on it. It turns out I did everything correctly. It just took a little knob twiddling. The sped up delay was the mod only setting if you turn the delays time until it is nearly as short as it can go you should start to hear the chorus vibist effect.from there use the knobs from the daughter board.
      I would however like the ability to get a wet only signal in this setting.

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    4. Did you guys sort out the issue with getting a modulated delay with the deep blue delay?? Im getting the same thing as Carlos. One short delayed/modulated setting and just two normal settings.

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    5. Tive esse mesmo problema de a PLFO entrar no lugar do pot de time, o que fiz foi ligar uma perna do LDR em série com 2k2 no GND e a outra perna no pino 2 do PT399, dessa forma tive o time do pot normal e a modulação em paralelo.

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  20. Would the Silonex NSL-32 work for the LED/LDR combo?

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    1. Should be fine. And I'd like you to test it because I've got some too, and then I'll know what to use :o)

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  21. sorry, beginner builder here so I'm pretty lost with regards to the modulation portion. I'm looking at the layouts and I'm wondering where the bright green 'Shape SW1, SW2 and SW3' is connected to. Is it a 2nd switch component on top of the modulation switch?

    And the modulation board is only connected to Time 1,2 and 3 from the main delay board?

    And as for general layouts, the red circle component is always a 5mm led?

    Lastly, I've built the DBD, and while it sounds great, I can't appreciate the white noise on higher settings. Since the Deprofundis has high filtering, this means it should have barely any white noise am I right?

    Thanks so much, especially Mark! this website is amazing!

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  22. oh another question..the parts count is very similar to that of the culture jam Neptune, yet this deprofundis delay is a high fidelity and high filtered delay while the Neptune isn't?

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  23. Has anyone achieved a "wet only" signal in the modulation only mode. If so how did you do it. Thanx.
    By the way I like this far better than the Deep Blue. I socketed the cap between the 2 ICs but have yet to try it with values other than stock. I will post again once I get time to. Dinosaur Jr is playing tomorrow so I need rest.

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  24. I'm troubleshooting my build. For some reason I'm getting a dry signal (no repeats) with the effect. I've checked my component values and the layout and can not find the issue.

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    1. To troubleshoot it properly you need to take voltage readings of all the pins. It sounds as though the PT2399 isn't doing it's job but IC2 is working fine which is why you're getting dry signal through. So take the voltages and post them here. The PT2399's are temperamental though and so swapping that for a new one is always a good thing to try.

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    2. Here are the voltages for the pt2399
      1) 4.9 2) 2.94 3) .6 4) .6 5) 2.97 6) 2.4 7) 4.55 8) 4.54 9) 104.6 (which can't be right) 10) 2.47 11) 2.47 12) 4.1 13) 3.16 14) 4.89 15) 4.94 16) 2.47


      Tl072 1) 4.73 2) 4.73 3) 4.73 4) .5 5) 4.73 6) 4.73 7) 4.73 8) 9.45

      78L05
      I) 9.45
      G) .5
      O) 4.94

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    3. Is the Ground value on the 78l05 unusually low, could it be a grounding problem or would that cause no signal to happen when the effect is on?

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  25. i think that all ground voltages should be zero.the g on 70l05 is unusually high, so there is a grounding problem for sure.and don't touch pin 9 on that pt2399!!!there is a problem there too...

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    1. I redid the off board ground and have switched to a different pt2399 (that I know works) but still nothing. Don't know what it could be.

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    2. Yes the ground value everywhere should be 0V. If you're measuring from a point that is supposed to be grounded and ground elsewhere then there should be no difference in potential. What point of ground did you measure the voltages using? If you used a sleeve of the input socket for instance, then it shows there is around a 0.5V difference between offboard ground, and ground on the board. That suggests a poor ground connection somewhere.

      And are you still getting over 100V on pin 9? That is a spectacularly dodgy reading.

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    3. Thanks for all the advice guys, I hope I can get this thing working without much more trouble. I was experimenting with it a little last night and discover the trimmer will continuously turn in either direction. I believe it's a 15 turn trimmer but I could turn it far more than 15 turns. This is my first build with a trimmer that is this style is this common, could this be the root of my issuer?

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    4. That just affects the delay time. The idea being that you dime the Time pot, and then keep turning the trimmer and you will see the maximum delay is increasing. Just keep doing it until you start getting distortion in the repeats so you can get the maximum delay time possible from that particular PT2399 without it distorting. The multi-turn trimmer just allows you to fine tune it more precisely than you can with a conventional trimmer.

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    5. Just turned the trimmer about 50 times in one direction. I can here it click but it never stops. Is it possible that it is turned all the way down and is restricting the time knob from allowing repeats? I might just try to take it out and run a jumper across the extra cut. Does this sound reasonable or am I barking up the wrong tree?

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  26. Hi, does this board (The first one, the most basic) have a diode on it at all? I've been looking at photos of the same circuit online and they seem to have diodes but I cant find it here at all.
    Cheers

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    1. You're probably seeing a parallel reverse polarity protection diode. I always omit them from layouts

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  27. Mine works fine. I had too switch pins 3 & 1 round on the feedback to get it to increase with clockwise movement

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  28. Hi guys,I'm daino1080 i have a problem with grindcustom deprofundis delay. I built the trimpot time version and the modulation board. When i run the effect withoit IC1 the effect and modulation work at a low volume, but when i plug IC1 there are no more sounds. What could it be? The layout has been triple checked and seems to be right.
    These are the voltages
    IC1: 1)4.45 2)4.45 3)4.45 4)0.00 5)4.45 6)4.45 7)4.45 8)8.89
    IC2: 1)4.95 2)2.47 3)0.00 4)0.00 5)3.54 6)2.47 7)0.58 8)0.62 9)2.47 10)2.47 11)2.47 12)2.47 13)2.47 14)2.47 15)2.47 16)2.47
    IC3: 1)4.57 2)4.57 3)4.57 4)0.00 5)4.55 6)4.55 7)4.55 8)8.89
    78L05: I)8.89 G)0.00 O)4.95

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    1. I seem to be having the same problem is this guy.... Same voltage readings from the ic and low volume overall... The effect works but it's just really quiet... I have to turn my amp up halfway just to hear it

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  29. Built max delay with daughterboard, but low volume when I kick the effect on. Any ideas on that?

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  30. Fixed it. I missed the cut next to the 1k resistor. Duh. Sounds killer now!

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  31. Sorry for the noob question, but if you build the daughterboard you run the time pot to both boards?

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    1. sorry but i don't understand your question.from daughter board's [time1] you'll go with just a wire to main board's time1 and from [time2&3] you go to time 2&3.by this, you'll have just one time pot, the mainboard's one.

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    2. Right, so can i run two wires off the pot to time 1 on mainboard and daughter board, and two wires to time 2&3? I understood one pot, just not sure how to hook it up.

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    3. yeah man that's right. hope you'll make it.but i would suggest to check the main board alone first to see if it works ok, and then add the daughter board.

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  32. i decided to build this with tails and modulation, and somehow it fired right up first try. modulation board too, using a random ebay photoresistor and a white led. i really it, tone control in the feedback loop should be mandatory on delays. it's almost too clean, sometimes i wish there was some dirt in the feedback, too...

    i made a bunch of changes from the original design, as i wanted something for subtle and interesting ambiance more than i wanted a slapback/echo machine. it sounds good cranked, but with the mix knob around 1/4 some of the crazier sounds start to make more sense...

    changes i made from the original:

    -tails mod. moved 1u capacitor at top left of the vero (c3, between input buffer and pt2399) to a little 4x7 jfet switch daughter board i made, based on the valve wizard small time delay. used a j201. patched right in to main board in where 1u cap was. this worked even better than expected. could replace that same input cap in just about any standard pt2399 delay/reverb to add tails.

    -max time mod. used the fixed 270k resistor. sounds great, more than i need for this pedal, doesn't get crappy at full, either.

    -darker repeats. replaced c7 with a 15n cap. sounds much better to my ears. the first repeat wasn't filtered enough before. i like the notes i am playing to stand out from the delay.

    -shape knob. the enclosure i had was drilled for 7 pots, 2 stompers and 2 leds, so i did the 500k shape knob. there are some interesting organic lopsided lfo patterns in there, for sure. can get real seasick if the depth is past half. i like it.

    -taming crazy mode. instead of a on/off/on for the modulation mode switch, I used a second stomp & led, which means I can only select between the two modulated modes. no problem, there is a depth knob, so i can get non-warbly sounds, too. during testing I had the pt2399 latch up on boot once, so I added a 1k resistor between the modulation mode switch and the ground connection. this has a side effect of changing crazy mode into a nice chorusy reverbish sound that I prefer to my equinox ii. may try 1.5-2.2k in future, as it's very claustrophobic... but i really like it with modulation and the mix rolled back.

    anyway, this thing is great!

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  33. Im a bit confused about the modulation board modes... so center is off, one position adds modulation to the delay repeats and the other position just gives you straight modulation with no delay at all?

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  34. Just tried posting but trying again...is there a mod for this circuit similar to the "dub madness" mod on the Echo Base, allowing for endless repeats when a switch is flipped?

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  35. hey lvlark, I have a couple of these http://uk-electronic.de/onlineshop/product_info.php?products_id=1797&osCsid=6bd2de2d06b70067039f92dfdae49055 laying around and was wondering if this would work with this delay. and what would i do with the time pot? thanks so much!

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    1. Omit the time pot on whichever delay board you want to build up, and connect the tap tempo board to pin 6 of the PT2399 via a 1K resistor.

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    2. okay thanks so just use the time pot for the tempo board and not the actual deprofundis board. then is it possible to add in the modulation daughterboard too?

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    3. Mark, would it be possible to add the modulation daughterboard and the tap tempo kit from uk electronic to the PT2339? I have already included the tap tempo kit (to the bdb) and now im`m wondering how to make the conections to the modulation daughterboard... Many thanks for your help!

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    4. Ok, a look in the schematic of the tap tempo kit (http://www.uk-electronic.de/Download/Beschreibung%20Tap%20Tempo%20DIL%20LED.pdf) and the datasheet of the MCP41050 (=digital pot) brings me to the assumption, that wiring must be the same as in case of normal delay/time pot. So [Time1] of the daughterboard goes to Pin 7 of the MCP41050 or to Time1 of the mainboard and [Time2&3] from the switch goes to Pin 5 or to [Time 2&3] of the main board.So tap tempo and modulation should be possible, i´ll try it soon.

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    5. I haven't had a chance to try it out yet but that seems to be what it is. let me know how it works out when you try it!

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    6. Please, I need to know if it finally works, I mean Tap Tempo Kit with this modulation daughterboard. The manual says there is no compatible with modulation at pt2399 pin 6, but I hope it could be possible. I really want tap tempo and modulation at the same time, for Deep Blue Delay.

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  36. Just a couple questions...

    Is there a way to add a dedicated Mix control to the modulation daughterboard?

    Also, is the "modulated delay" just modulation on the repeats, or running in tandem with the delay?

    What type of modulation is it?

    Thanks,

    -Ryan

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  37. It is pitch modulation that occurs on the delayed signal.

    Also, I just realized today that a momentary spst n/o stomp could be added between lugs 2 & 3 of the feedback pot for on demand rushes of self oscillation that reverts to the normal setting when released. It's a 10 min. mod that adds another touch of cool to this one. I'm sure it would work on others like the Deep Blue as well.

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  38. Hi Mark,
    Thanks for the layout, I build it last night and I'm troubleshooting my build. For some reason I'm getting a dry signal (no repeats) with the effect. I've checked my component values and the layout and can not find the issue
    I checked the voltage and I think they are ok
    Thanks for your help
    Nicolas

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  39. Hi Mark,
    Thanks for this great layout, build it and worked at the first try... almost!
    It sounds great, but it boost too much the signal, compared to dry, overdriving the amp.
    Should I look for some trouble, or simply give the blame to a "mutant" TL072, add a volume pot on the output and simply enjoy the boost capability too?
    Anyway, this site is amazing, and you are n.1 !!!

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    1. I have exactly the same problem! When I kick in the effect the volume jump up a lot!
      I double checked the circuit, soldering, components, but everything seems to be right.
      I also tried to change TL072 with another, and even with a 4558, but it gives the same result.
      I post the voltages, eventually someone could help us.
      IC1: PT2399
      1) 4.5
      2) 2.21
      3) 0
      4) 0
      5) 2.92
      6) 2.25
      7) 0.52
      8) 0.65
      9 to 16) all 2.25

      IC2: TL072
      1) 4.75
      2) 4.75
      3) 4.73
      4) 0
      5) 4.72
      6) 4.75
      7) 7.75
      8) 9.48

      I really would like to use this, and I need it also! Can someone help please?

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    2. God, forgive your son because I am stupid!
      I had taken a 510 ohm resistor in place of a 510 K !!!
      Solved, now it works wonderfully!
      I think I`ll build the mod db too!

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    3. Ok, I did a similar mistake (shame on me), so now it's working perfectly!
      I also discovered that, in my build at least, the trimmer in the "long delay" version is useless. Without it my board can stand the pot at the end without distorting or messing up anything, and with a wonderful long delay that would have inspired Brian May :-)
      I did also a small mod, using a 3pdt switch, I have now two time pot, so I can set one for slapback and the other for long delay, at the touch of my feet.
      What a wonderful piece of junk :-) Thank a lot for this!

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  40. I built this pedal December 2014, with the modulation board and all, and I still love it, however I recently decided to make a modification to fix 2 small issues.

    The first one is connecting the modulation board's ground to the bypass footswitch's LED indicator ground. This turns the modulation board completely off and prevents the LFO from ticking while the pedal is in bypass, which can be heard when the amp is cranked up loud.

    The second mod is to completely remove the 100p capacitor that is located at the top left, next to the 330K Resistor. This capacitor actually filters your dry signal, removing some of the highs, which is completely unnecessary I found. I use distortion and fuzz before the DeProfundis delay, and it removes a noticeable amount of treble! Tone sucking! But now, with the mix turned down, the dry signal is absolutely pristine, as it should be! DO THIS!

    I recommend doing these if you're about to build this, or have the problems I did.

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  41. Hi, I have a problem with this build.
    This is not the first time I build this delay but this time I'm going crazy because I can not find the problem. I don't hear nothing... if I turn fully clockwise the pots I can hear the feedback from the pt2399 but I can't hear the sound coming from my guitar. I've changed the ICs and double-checked the wirings... but... I'm still not hearing anything. Can you help me?
    This is the vultage measurements (pots fully clockwise):
    TL072
    1) 4.63 2) 4.63 3) 4.61 4) 0 5) 4.61 6) 4.63 7) 4.63 8) 9.25
    PT2399:
    1) 5.09 2) 2.54 3) 0 4) 0 5) 2.92 6) 2.55 7) 3.9 8) 3.9
    from pin 9 to 16) 2.55

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    1. If I turn on the pedal without the TL072 opamp I can hear the signal (obviusly very low) with the delay effect... but if I engage IC2 all turns to silence. I also tried to swap IC2 with other opamps but nothing changed...

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  42. Hello Mark. Please, Could you tell me if is possible adding this modulation daughterboard to a Deep Blue Delay with de Tap Tempo Kit from Uk Electronic?
    And if so... serial or parallel with the tap tempo?

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  43. I would like to add and fx loop to this pedal. I would like it to function so that each repeat gets more of whatever effect is in the loop. For example, if I put an octave effect in the loop, each repeat would go up/down another octave. Does anyone know how to achieve this? I have heard of people putting a trs jack somewhere in a delay circuit but this stuff is still a little over my head.

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    1. Maybe after 1uf electro that is after pt2399 and before 2k resistor to feedback. Hope this can help

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    2. Maybe after 1uf electro that is after pt2399 and before 2k resistor to feedback. Hope this can help

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  47. Hi all,
    I made several of them (dIy) and I follow that site.
    So, today i've got a problem,
    Have you already hear something about high cut on input or out put ?
    Where can i find diagram ?

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    1. Still looking for Depronfundis delay schematic. Anyone ?
      I've a tone problem, i guess i 've nothing over 4kHZ.

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    2. Use google, you'll find it.

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    3. Where the highs go amiss? Have you probed it? Are all cap values as noted on the layout?
      +m

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  48. To Zack : I do not find any deprofundis delay schemaic on google, really sorry

    To Mirosol : I tested frequencies with an parametric EQ. All cap values are notified on the layout, i will check it again.

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    1. hi prodprod. i just typed in the name of the effect schematic. for this the first link is to the grindfx website. on the site you can find the pcb, with the build document. the build document contains the schematic. sometimes the schematic show right up, other times you have to look at the main source.

      http://www.grindcustomsfx.com/product/gcfx-deprofundis-delay/

      click on the build build document and you'll get all the info you want.

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  49. Schematics:
    https://dl.dropboxusercontent.com/u/28586266/GCFX%20Build%20Docs/DeProfundis_Build.pdf

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    1. The link's been on Grind Customs webpage all the time.
      +m

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    2. I searched on grind customs site but found nothing.

      Thanks for all ! you rocks ;)

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    3. I will check PCB one more time.
      But i guess, high frequencies are cut cause i place my delay after a Fuzz (Fuzz factory). Impedance of circuits are very different.
      As you, is it issue ?

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  50. Hi, I finished the Leviathan posted by Alex and added this modulation daughterboard, it works fine, except the switch gives modulation only/delay only/delay only, I tried swaping time 1 with time 2,3 but then I obtained modulation only/delay only/modulation only haha. What would be the problem?

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    1. I've had the exact same issue with the leviathan + this mod board. any ideas?

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    2. Yeah me too, did you guys ever figure it out?

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  51. Hello.
    I connected this modulation board to the Deep Blue Delay I built with this layout: http://tagboardeffects.blogspot.gr/2012/02/mad-professor-deep-blue-delay.html.
    Connected Time 1 and Time 2,3 from the add-on board to the DBD's Time pot accordingly. Problem is that there is only one switch position where there seems to be an effect. It's when SW2 connects to Time2,3 where there's modulation only on the original signal (There are no repeats). On the other two positions , there's just normal delay. It's probably the same problem people mentioned above.

    Any ideas/help about this? Thanks in advance..

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  52. I always get a loud thump through the speakers whenever I engage this effect, despite having a 1 meg pulldown resistor on the input - what will replacing this with a 2.2 meg - to 10 meg resistor do instead?

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    1. Threw in a 100K pulldown resistor from the hole between Output and the 1K resistor to ground, that may help.

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    2. Damn, that's a nasty pop!
      I'm having the same issue. Do I only need the one resistor mentioned above or do I need another pulldown near the input? Please be specific as to where on the board the pulldown resistor might go, I'm still pretty green. Thanks, you all rock!

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    3. Fixed it! I put a 100k resistor going from ground to the hole between output and the 1k resistor(on the right side of the board) as stated above. So stoked on this pedal now! Thanks for a great website!!

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  53. Just built this and have 2 small-ish issues (i built the one with the trimmer and the modulation board), everything is great apart from:

    1. The pedal output volume is huge compared to my clean signal, its almost as if i have a boost cranked all the way when i turn it on.

    2. Even when cranked i can only get 3-4 repeats from the delay (if you turn it all the way down you only get 1, so the pot is doing something), any ideas? Dodgy pt2399? Ive tried a couple in there but same issue

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  54. I can't get the LED to blink im using 2.4v leds. Anyone?

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    1. Hey, did you ever get this working? I've got the same problem.

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  56. IvIark hello, help me with the scheme of modulation veroboard thanks

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  57. Hi, I am looking at the mod board design and I am wondering why pin 1 of the Depth pot goes to +9v via a 330r resistor, and not e.g. to ground?

    (Okay it's because actually I built the mod board for a Wampler Faux Analog Echo clone from over here: https://goo.gl/vfX62u and well, with delay modulation switched on and depth pot fully CCW delay time just gets totally messed up (turns into shortest delay time). As I turn Depth up, delay time increases again and modulation starts to kick in.

    So that's why I was wondering if connecting Depth 1 to ground instead would give me an actually usable depth control. Sorry about my English, hope you guys understand what I mean?

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  58. I think you´re describing is the "modulation only" setting, where "time" behaves like a kind of phasing delay control and "feedback" behaves like a flanger feedback.

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  59. Hey guys, resurrecting an old problem.
    Using the above daughterboard with the de profundis, have the delay side working great, can not get the LED to blink. I can change its brightness with the depth knob, and the rate knob won't really do anything. I've tried making the whole board over, same result.
    I noticed some other people had that problem earlier, but then there were edits made to the layout, right?
    Can anyone help? Thanks guys!
    Jonathan

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  61. please help, Noob builder, but learning slowly.
    built this first circuit and am having trouble. the echo cuts off if the 50k time pot goes above 2.3k, and the feedback runs away when that 50k pot goes above 4.5k. any clues?
    thanks

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  62. for anyone having trouble with the modulation switch paired with a Deep Blue Delay, I have a solution: Like a few other builders, I was getting Modulation / Delay / Delay. If you're getting a similar X/Y/Y combination, notice the DeProfundis board has a 2.2k resistor from Time 1 to ground. The DBD does not. Add a series resistor (I connected mine directly to Delay lug 1), and you will get the proper X/Y/Z switching (modulation / delay / modulated delay).

    The value of the resistor will depend on the LED/LDR combo you're using. Higher resistance yields more modulation on the repeats in position 3, but adds a short delay to the "modulation only" position 1 setting, rendering it less of a chorus/vibe and more of a modulated slapback. Experiment with values to find a good balance. I ended up with a 3K resistor. I'm using a 5mm white LED and a similarly-sized LDR.

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    3. The 2.2K resistor from Time 1 to ground is in series with the delay pot (which is a 50K variable resistor) and so the resitors can be swapped. This is done here in comparison to the Deep Blue Delay. The DBD has the resistor (2.7k) on the other side of the Time pot. So the only thing you have to do to make the modulatiion board work right is swapping the resistor from Delay 2&3 to Delay 1. Therefor take the wire from the board to Delay 2&3 three rows down directly to pin 6 of the PT2399 and solder an other 2.7K resistor from delay pot lug 1 to ground (the old 2.7K can be left on the board). Then connect the modulation board in the same way as in the case of the DeProfundis and that´s it. You get all three settings and a realy good and intensive modulation (I used the nsl-32). Have fun!

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  63. fyi: a h11f1 works great on the daughterboard in place of the led/ldr combo, just needs a little bending...

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  64. Built this one by the original layout (without mods) and fired up right away. thank you. i'd like to pass it on to pcb and board mounted pots... anyone with schematics?? grindcustoms isn't online anymore :(

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  65. Could anybody please confirm the 100K trimmer in the long delay layout?! I dont`t think 100K make sense, because the resistor/ trimmer is in parallel with the 100k log pot and so it`s not about 75K like Rej mentioned in the post above but rather 50K. So i asume a 500K multiturn trimmer would be better. Besides in my opinion a 100K lin pot has a better range.

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    1. I soldered the 270K directly to time pot 1 and 3 (through the small holes, not the lugs) and it works great. Mathematical logic for me says that a 100K trimmer couldn`t work, you will get a 50K time pot and so normal delay length.

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  66. Finally got my PT2399 chips so I could plug it in and check it out. The first order of chips arrived and were SMD so not super useful. I found an Ebay seller, bought a lot of 25 and they arrived in a week.

    I built the first layout, without the daughterboard for modulation... I may build another in a larger enclosure to achieve that. This one fits in a 1590B enclosure with a battery just in case I want to run it that way.

    It went without a hitch except that the 47nf failed for some reason and became a 1 ohm resistor, preventing the Feedback control from doing anything. After I figured out what was going on, I replaced it and BAM! It works. What an awesome device!

    This is by far the most flexible and user friendly delay pedal I've ever used. Love the layout too!

    I've got 24 more PT2399 chips so, I'll likely build another in a larger enclosure for the modulation controls.

    Thanks Rej, for the awesome pedal design and thanks IvIark for yet another awesome layout. I've done a couple of the more complex layout here on Tagboard Effects and I'm really digging the elegance of design and how compact they are. One day, I hope to contribute something useful back.

    Cheers,
    Andrew

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  67. Greetings to all. I built the modulation board.
    it works very very well. I used a 3mm blue LED and a photoresistor
    45k / 140k and 10m dark and NE5532 op amp,
    square wave really strong, really fun.
    I have only one question, I would like to add a second pulsation LED to put on the outside. Is it possible? and how should it be connected? parallel or in series?
    thanks for your attention, great site for layout effects

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    1. Oh! Thats what im looking for too! Did you find a way or still searching?

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  69. Is there any way to put an indicator LED to show us the waveform/rate/depth of the daughterboard? I used this daughterboard on a neptune delay and works really well. Still getting a little bit of delay with the "modulation only" mode though.

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  70. "There is also a tone control trimmer to adjust the high pass cutoff frequency on the repeats."
    Am I missing something ? I do not see the trimmer on the veroboard ?
    Has it been replaced by a fiexed resistor ?

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